The DUF ballscrews are a upgrade from the standard SUF ballscrews that other companies are using. These DUF ball nuts offer less backlash than SUF.
1605 series X axis DUF Ballscrew with Nut: 10mm mount bearing
1605 series y axis DUF Ballscrew with Nut: 10mm mount bearing
2005 series z axis DUF Ballscrew with Nut: 15mm mount bearing
***Not Sold Separately*****